C8051F331 Silicon Laboratories Inc, C8051F331 Datasheet - Page 96

• Manufacturer Part Number: C8051F331
• Description: IC 8051 MCU 8K FLASH 20MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F33xr

Specifications of C8051F331

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

C8051F330/1, C8051F330D
11.1.3. Flash Write Procedure
Flash bytes are programmed by software with the following sequence:
Steps 5-7 must be repeated for each byte to be written. After Flash writes are complete, PSWE should be
cleared so that MOVX instructions do not target program memory.
Table 11.1. Flash Electrical Characteristics
VDD = 2.7 to 3.6 V; -40 to +85 ºC unless otherwise specified.
96
Flash Size
Endurance
Erase Cycle Time
Write Cycle Time
*Note: 512 bytes at addresses 0x1E00 to 0x1FFF are reserved.
Parameter
Step 1. Disable interrupts (recommended).
Step 2. Erase the 512-byte Flash page containing the target location, as described in
Step 3. Set the PSWE bit (register PSCTL).
Step 4. Clear the PSEE bit (register PSCTL).
Step 5. Write the first key code to FLKEY: 0xA5.
Step 6. Write the second key code to FLKEY: 0xF1.
Step 7. Using the MOVX instruction, write a single data byte to the desired location within the 512-
Step 8. Clear the PSWE bit.
11.1.2.
byte sector.
C8051F330/1, C8051F330D
25 MHz System Clock
25 MHz System Clock
Conditions
Rev. 1.2
8192
20 k
Min
10
40
*
100 k
Typ
15
55
Max
20
70
Erase/Write
Section
Units
bytes
ms
µs